Lubricator for internal combustion engines



July 4, 1933.

w. M. s. JACKSON ET AL- LI IBRICATOR FOR INTERNAL COMBUSTION ENGINES Filed Feb. 15, 1929 3-Sheets-Sheet 1 1 v gwuento'o M. S. MA4m i 4 6104mm y 1933-v w. M; s. JACKSON El AL 1,917,125

LUBRICATOR FOR INTERNAL COMBUSTION ENGINES Filed Feb. 15, 1929 :5 Sheets-Sheet '2 r 1 I v r i n I Jul 4, 1933 W. M. S. JACKSON ET AL.

LUBRICATOR FOR INTERNAL COMBUSTION ENGINES Filed Feb. 15'; 1929 3 Sheeis-j-Shet 3 ammqs Patented July 4, 1933 UNITED STATES PATEN office WILLIAM M. S. JACKSON AND PAUL F. HACKETHAL, OF DETROIT, MICHIGAN; LUCILE J'. P. JACKSON, ADMINISTRATRIX OF SAID WILLIAM M. S. JACKSON, DECEASED, AS-

SIGNORS TO NATIONAL BANK OF GERMANTOWN 6c TRUST COMPANY, TRUSTEE, 01E PHILADELPHIA, PENNSYLVANIA, A CORPORATION LUBRICATOR FOR INTERNAL COMBUSTION ENGINES Application filed February 15, 1929. Serial No. 340,270.

This invention relates to a device for feeding a small measured quantity of liquid in the form of a mist orvapor to the intake manifold of internal combust on engines, such liquid being drawn into the cylinders along with the fuel vapor and acting to prevent carbon deposits, to prevent knocking of the motor, to neutralize acids formed during combustion or to lubricate the cylinder walls.

One of the principal objects of th s invention is to provide such a device in which the feed of fluid is practically constant regard less of the velocity of the gases in the intake manifold and regardless of the underpressure therein.

Another important aim is to provide a complete device of this character which contains no moving parts and in which, in particular, the compensation for low and high intake manifold velocities and underpressures is effected by means having no mechanically operating parts.

Another purpose is to provide a device of this character which is entirely fool-proof, and which, once properly installed, cannot be adjusted or placed out of adjustment, thev adjustment being originally effected by the provision of one of a series of metering plates which is permanently secured in place.

Another object is to provide a device of this character in which all parts are readily accessible, and by the ready replacement of the metering plate can be adjusted to feed any desired amount of liquid.

Another purpose is to provide such a device which is inexpensive in manufacture and easy to assemble and in which the changeable metering plates which determine the capacity of each device are of practically nominal cost.

A further object is'to provide a compensator which not only balances the varying velocities and underpressures in the intake manifold to draw a constant amount of fluid into the manifold at all engine speeds, but it also prevents a back fire through the reservoir and avoids the use of a check valve for this purpose.

A still further aim is tov provide such a vide an initial charge of liquid to counteract harm which may be caused by unconsumed gasoline being deposited on the cylinder walls while starting.

In the accompanying drawings:

Figure 1 is a side elevation of our device showing the same mounted on the dash board and connected with the intake manifold of an automobile motor.

Figure 2 is a vertical longitudinal section therethrough.

Figure 3 is a fragmentary enlarged vertical section of the pump atomizer head shown in Fig. 2.

Figure 4 is a fragmentary horizontal section taken on line 4-4, Fig. 2.

'Figures 5 and 6 are top plan views of two metering plates adapted to be mounted in the device to provide for the feed of different amounts of the fluid.

Figure 7 is a vertical section through the compensator used in connection with the device shown in Figs. 16.

I Figure 8 is a horizontal section taken on line 8-8, Fig. 2.

-Figure 9 is a vertical sectional view of a modified form of the device for use on busses 'or trucks in which provision is made for feeding a small initial charge of fluid to the intake manifold on pulling the choke out more than half way in starting the truck or bus engine.

Figure 10 is a horizontal section of a modifled form of diaphragm compensator, the section being taken on l ne 1010, Fig. 11.

Figure 11 is a vertical section through the modified form of diaphragm compensator.

Figure 12 is a fragmentary side elevation partly in section in which the compensator is formed as an integral part of the head of the device instead of being attached to the intake manifold as in the preferred construction.

Similar reference numerals refer to like parts in each of the several views.

In its general organization, this invention includes a reservoir having an upper chambe r which is connected by a conduit to a compensator, which compensator is in turn connected with the intake manifold of the automobile motor. The compensator is so designed that, regardless of the varying conditions of gas velocity and underpressure in the manifold, it will maintain a uniform underpressure in the conduit and chamber. Within the reservoir a pump is provided having the form of an atomizer which is operated by the underpressure in the upper chamber to elevate the liquid in the reservoir and discharge it in the form of a mist into the chamber from which it is drawn through the conduit and compensator into the intake manifold where it mingles with the fuel gases and is drawn into the combustion chambers. An excess of vapor is generated by the pump and a metering plate is provided which permits only a measured amount of the vapor or mist to pass into the conduit. The invention also comprehends an arrangement of baflies in the atomizing chamber and a pad for storing a quantity of the liquid which stored liquid is available when the motor is started and before the pump has time to start functioning efficiently. The invention also includes details of mounting the reservoir and structural details of the various parts.

In the preferred form of the invention illustrated in Figs. 18, the numeral 15 represents the intake manifold of an automobile motor, 16 represents the usual dash board, 17 represents the glass reservoir in which a quantity of the liquid is stored, 18 represents the spray chamber, 19 represents the atomizer pump discharging into the spray chamber 18,

' 20 represents the compensator which is directly connected to the manifold and 21 represents the underpressure conduit between the compensator 20 and the spray chamber 18.

As best' shown in Fig. 2, the reservoir 17 for'storing the liquid to be fed is preferably made of glass so that the level of the liquid in the reservoir can be instantly observed and at its bottom is formed to provide a sump or Well 22 in the bottom of which any dirt or other foreign matter present in the liquid can collect and from which the liquid is withdrawn. At its upper rim, this glass reservoir is formed to provide'an outwardly extending flange 23 and to this flange is secured a cast metal head 24 which covers the upper end of the glass reservoir, a gasket 25 of suitable material being placed between the rim of the glass reservoir and the head 24. To attach the reservoir and associated parts to the dash board 16 of the automobile, a pressed metal bracket is provided which engages under the flange 23 of the glass reservoir and is tightly secured to the head 24 so as to also serve to hold these parts together. As best shown in Figs. 1, 2 and 8, this bracket comprises a horizontal part 26 having an opening 27 which receives the body of the glass reservoir 17 and a vertical flange 28 having holes to receive bolts 29 for securing this flange to the dash board. Around the opening 27, the bracket is formed to provide a depending annular strengthening flange. 30 and reinforcing corrugations 31 are also preferably provided between the horizontal part 26 and the attaching flange 28. To secure the head 24 of the reservoir and the bracket tightly together and clamp the glass reservoir therebetween, the head. 24 is provided with a plurality of ears 32 which receive bolts 33. These bolts 33 extend through the bracket and are provided with nuts and lock washers so that upon tightening these bolts the head 24 and bracket are drawn together and a leak tight joint provided between the glass reservoir and the head 24. To avoid breakage of the glass reservoir a gasket 34 is also provided between the flange or rim of the reservoir and the bracket as best shown in Fig. 2.

At its center the reservoir head 24 is recesscd to receive a glass cylinder 35 which is closed at its upper end by a small cast metal head 36 and forms thespray chamber 18. This spray chamber head 36 and glass cylinder 35 are held in place by bolts 37 which extend through ears provided on the head 36 and are screwed into bosses 38 on the reservoir head 24 and suitable gaskets are provided to insure a tight joint between these parts. The spray chamber head 36 is preferably of conical or pyramid form and is provided with a central threaded opening which receives the fitting 39 at the inlet end of the conduit 21.

The pump 19 is arranged to spray a mist of vapor into the spray chamber in excess of that required. The nozzle 40 of this pump, as best shown in 3, is in the form of a threaded plug which is received inan opening provided in the head 24 and is held in place by a nut 41 which bears against the upper side of the head 24. An opening 42 extends vertically through this nozzle, the pump opening being threaded at its lower end and constricted at its upper end. Within this opening is screwed a jet nozzle 43, which has a reduced neck at its upper end terminating at the constriction in the passage 42. The upper end of the passage 44 through the jet nozzle 43 is constricted and the lower end is enlargedand receives the end of a lift tube 45. The lower end of the lift tube 45 is arranged in the well 22 of the reservoir and carries a sleeve 46, the lower end of which is extended laterally and has soldered thereto a cylindrical piece 47 of wire gauze or the like. This gauze cylinder is closed at its lower end and it therefore follows that any liquid drawn into the lift tube 45 is first screened through the gauze and hence no foreign matter of sufiicient size to interfere with the proper operation of the device can be drawn into it. It will also be noted that the gauze cylinder 47 rests directly on the bottom of the reservoir. By this means a press fit is all that is required between the sleeve 46 and the lift tube 45 since the gauze cylinder 47 is in part supported by the reservoir.

In one side of the nozzle 40 of the pump an opening 48 is provided which extends through to the passage 42 and receives a tube 49. The other end of this tube 49 is connected to the lower end of a. plug 50 by means of a screw cap 51, this plug 50 being screwed through the head 24 of the reservoir and being provided with a passage 52 which connects the tube 49 with the atmosphere or other gaseous medium source. The'upper end of this plug 50 is recessed and in this recess is arranged a disk 53 of metal screening and a felt plug 54 supported on the disk. By this means all air or gas entering the device is filtered through the felt pad 54 and screen 53 so that no foreign matter can enter to clog the orifices in the pump or other parts of the device.

On the opposite side of the reservoir head 24, a filling plug 55 is provided and to permit the excess liquid sprayed by the pump 19 into the spray chamber 18 to return to the reservoir, a plurality of openings 56 are provided in the reservoir head 24 around the pump nozzle 40.

It is apparent that when an underpre'ssure is created in the vapor chamber 18 that air from the atmosphere is drawn through the felt pad 54, screen disk 53, passage 52' in the plug 50, air tube 49, opening 48, passage 42 in the nozzle 40 and past the outlet end of the jet nozzle 43. The air passing the nozzle creates an unde'rpressure in the pass sage 44 and hence the liquid from the reservoirwell 22 will be drawn through the gauze cylinder 47, lift tube 45, passage 44 in the jet nozzle 43 and will be discharged in the form of a spray or mist into the spray chamber 18. The excess of liquid so sprayedreturns through the openings 56 back to the body of liquid in the reservoir. It is also apparent that the amount of air passing through the device can be regulated by varying the free area between the tip or upper end of the jet nozzle 43 and the nozzle 40. The et nozzle must therefore be carefully fitted to effect exactly the right restriction in the passage 42 and eflect the exact feed of air required.

' Only a part of the liquid so sprayed is withdrawn from the spray chamber, this amount being determined by a metering plate or disk 57 which is held between the glass cylinder 35 and the spray chamber head 36- As best shown in Figs. 5 and 6 the metering plate or disk is made of sheet metal and is provided with a plurality of small holes 58,

these holes being of an exact size in all disks -measuring holes 58 and in Fig. 6 is illustrated a metering plate having two of such holes,

the amount of fluid passing either of these plates being, of course, proportional to the number of holes. The holes can also be made larger or smaller to provide metering plates of the desired capacity. By the use of such metering plates, the properplate is employed and thereafter cannot get out of adjustmentor alter its feed through the movement of any adjusting parts either under the vibration of the car or by one attempting to alter it and since both the air and liquid have been filtered, there is no danger of these holes becoming clogged.

Under the metering plate 57 a baffle 59 is provided, this bafile being in the form of a metal disk which is caught at its edges between the metering plate'57 and the gasket for the glass cylinder 35, the central portion of this bafile being dished downwardly so as to provide a space 60 between the metering plate 57' and the baflie. This baffle plate 59, as best shown in Fig. 4, is provided with three or more large holes 61, which are spaced about the center of the plate and are protected from the direct spray from the jet nozzle 43 by a bell shaped guard 62. This guard may be secured to the bafiie plate 59 by soldering or in any other suitable manner.

By this arrangement of bafile and guard, the vapor laden air in the spray chamber passes around the lower edge of the guard 62, through the holes 61 in the baffle plate 59 and across the space between the baffle and metering'plates and through the metering holes 58 in the metering plate. The vapor laden air is therefore required to traverse a circuitous path before passing through the metering holes. If the metering holes 58 were not so protected against the direct spray from the jet nozzle 43, the feed of liquid would not be uniform since the nozzle would tend .to spray an irregular amount of liquid directly through the metering holes. When starting, there is a slight lag before the pump 19 starts to operate and before the spray chamber 18 is filled with a mist of the liquid in the reservoir. To reduce the consequent lag in the feeding of the liquid to the intake manifold, a small hole 63 is provided centrally through the baflie plate 59 and guard 62. This small hole provides a more direct passage of the vapor laden air through the bafiie and guard and hence provides for a quicker flow of the liquid'through' the metering plates. This hole 63 is, however, so small as to have no, appreciableefl'ect after the device has been run sufiiciently long to charge the spray chamber 18. I

Above the metering plate 57 is arranged a spacing washer 64 which supports a felt pad at its edges, and between this pad and the spray chamber head 36, a disk 66 of metal gauze or screening is interposed. The function of this pad 65 is to store a quantity of the liquid when the motor is stopped and the device ceases to function and to provide a charge of the liquid which is immediately available when the motor is started again. During the operation of the device the liquid laden air is drawn directly and in a straight line from each metering hole 58 to the inlet of the fitting 39. During this period the pad 65 becomes saturated, but immediately above each metering hole 58 no liquid accumulates since these portions of the pad are in the direct path of the air flow. When, however, the engine is stopped and the underpressure is cut off, the pad becomes saturated its entire extent and consequently on again starting the engine, the air is immediately drawn through the saturated pad and picks up the liquid therein. This occurs before the pump 19 has come into operation and has filled the spray chamber 18 with vapor. It is therefore apparent that this pad materially reduces the time lag between the starting of the engine and the operation of the device and provides an instant supply of the liquid when it is most needed.

To provide a constant feed of liquid under all conditions of engine operation, it is apparent that there must be a uniform underpressure in the conduit 21. As is well known both the velocity of the gases and the underpressure in the intake manifold of the engine vary widely under different motor speeds. At nearly closed throttle there is a high underpressure in the manifold and a low gas velocity and as the throttle is opened these conditions reverse in proportion to the speed. It is therefore apparent that to provide a uniform underpressure in the conduit 21, a

compensator must be provided which at open throttle conditions will effect an underpressure in the conduit which is greater than that in the manifold by taking advantage of the velocity of the gases in the manifold and at low engine speeds and closed throttle will effect an underpressure in the conduit which is less than the underpressure in the manifold. The present compensator 20 has been found to maintain a practically constant underpressure in the conduit 21 at all engine speeds and furthermore eliminates all danger of a back fire through the reservoir.

As best shown in Fig. 7, this compensator includes a body 67 which is threaded at one end and is screwed into the wall of the intake manifold 15. In this body 67 is formed a longitudinal tapering passage 68, the large end of which opens into the manifold 15 and the small end of which extends through a small neck 69 and opens into a chamber 70.

At the outer end of this body 67 a hollow plug 71 is permanently mounted, the inner cndof held in place by a thimble 74 so that the passage through the plug can be closed off by placing ones finger over the open end of the plug for a purpose which will presently appear. At its inlet end the chamber 70 is enlarged and connects with the outlet end of the conduit 21 in any suitable manner as by the conventional screw collar 7 5.

It has been found in actual practice that with a compensator .designed as described, that a practically constant underpressure is maintained in the chamber 70, conduit 21 and spray chamber 18. By this means the same amount of liquid is fed per unit of time regardless of whether the motor is going fast or slow such a constant feed provides the necessary amount of liquid under all conditions. By inverting the screen 73 of the compensator, in the event of a clogged passage anywhere in the pump 19, spray chamber 18, conduit 21, or compensator 20, the operator can place his finger over the end of the plug 71 and thereby cause the full underpressure in the manifold to be connected with the entire system and clear any obstructed passages. It is also apparent that in the event of a back fire in the manifold, suchback fire will blow through the passage 68, port 72, a screen 73 and cannot blow through the reservoir and injure this part of the apparatus.

A summary of the operation of the preferred form of the invention as above described is as follows:

Upon starting the engine a high underpressure is created in the manifold with a low velocity of the gases therein. Through the compensator 20, this induces a predetermined underprcssure in the chamber 70 and this predetermined underpressure through the action of the compensator is maintained as the engine speed increases and the underpressure drops and the velocity increases in the manifold. The underpressure in the chamber 7 0, through the conduit 21 creates a uniform underpressure in the top of the head 36 of the spray chamber and air from the atmosphere is drawn through the felt pad 54, screen 53, passage 52, air line 49, opening 48, passage 42, spray chamber 18, holes 63 and 61, metering holes 58, felt pad 65, screen 66, fitting 39, and conduit 21 through the'compensator 20to the intake manifold. Since the pad 65 in the spray chamber 18 is saturated with liquid the first effect of the movement of the air is to draw the liquid from this pad which thereby provides an initial charge of the fluid for the motor. Thereafter the pump 19 comes into operation and the liquid is drawn from the well 22 of the glass reservoir 17 through the screen 47, lift tube 45, and passage 44 in the jet nozzle 43 and is dischar ed as a fine mist into the spray chamber. efore the spray chamber 18 is completely filled with the mist, a small amount of the spray passes directly through the central hole 63 in the bell guard 62 and baflle plate 59 and this passes directly through the metering holes 58 and out through the conduit 21 as described. By this means a preliminary feed of the liquid is provided in addition to the initial withdrawal of the liquid from the pad 65. After the spray chamber 18 has been filled with the vapor, the mixed air and liquid is withdrawn in the regular manner through the holes 61 in the battle plate 59 and through the metering holes 58 in the metering plate 57, whereby a definite amount of oil is fed per unit of time as long as the engine is operated.

When the engine is stopped the underpressure, of course, ceases and the pad 65 which during the operation of the engine is saturated except at the spots over the metering holes 58, becomes saturated throughout and is ready to provide a preliminary charge of liquid as described.

It is obvious that instead of attaching the compensator directly to the intake manifold, it can be attached to the head 36 of the spray chamber 18 and connected by a conduit with the manifold. Such a construction is illustrated in Fig. 12 in which the body 67 of the compensator 20 is formed integrally with the head 36 of the spray chamber and the compensator is connected by a line or conduit 76 with the intake manifold in the usual and well known manner. In other-respects it is similar in "construction and operation to the preferred form of the invention illustrated in Figs. 1-8.

In Figs. 10 and 11, a modified form of compensator is provided in which a diaphragm valve is employed in addition to the compensator as shown in the preferred form. In this modified form of the invention the compensator includes a diaphragm valve body 77 which is .formed integrally with the body 67 of the type of compensator described with reference to the preferred construction. This last named body is constructed and functions in the same manner as the preferred type of compensator, having the tapered passage 68 which can be directly connected with the manifold or through the medium of a conduito'ifi, a hollow plug 71 having a port 72 in line with the passage 68 and a passage or chamber 7 O which in this modified construction is connected with a diaphragm chamber 78 of the diaphragm valve body 77 The diaphragm body 77 is vertically disposed and the upper end of the diaphragm chamber 78 is closed by a metal diaphragm 79 held in place by a collar 80. To this diaphragm 79 is. suitably secured a pin 81 which bears against the topof a valve 82. This valve seats on a conical seat 83 formed on the body 77 at the upper end of a cylindrical chamber 84. A threaded opening'85 is provided at the side of this chamber 84 and in this opening is suitably secured the end of the conduit 21 which connects the compensator with the spray chamber. The valve 82 is provided with a depending stem which is formed at its lower end to provide a cylindrical guide 86. Between. this guide 86 and a screw cap 87 provided at the lower end of the diaphragm valve body 77, a helical compression spring 88 is interposed. a

1th the foregoing arrangement in the event that the underpressure in the diaphragm chamber 78 becomes greater than that at which the device is set to operate properly as in the case of a lag in the functioning of the compensator 20 when changmg motor speeds, the diaphragm 79 is imme rliately depressed thereby moving the pin 81 downwardly and closing the valve 82 against the resistance of the spring 88. This restricts.

the flow of vapor and air from the spray chamber 18 to the manifold and thereby reduces the underpressure in the conduit 21 until the proper underpressure has been restored in the diaphragm valve chamber 78 when the valve 82 opens and permits the free passage of air through the compensator.

In Fig. 9 is illustrated a form of the invention. which isadapted for use on trucks or busses. In this form the reservoir 90 is preferably made of sheet metal, the bottom 91 and the top 92 being connected to the side wall 93 by seaming or in any other suitable manner. To the sheet metal top a cast metal ring 94 is secured and on this ring is supported a cast metal head 95, a suitable gasket 96 being interposed between this head and ring to insure a tight joint. Both the head and the ring 94 are, held down by a plu rality of bolts 97 which extend through the top 92 of the reservoir, ring and head.

The head 95 carries a pump 19 and spray chamber 18 and its associated parts, these elements being identical with the preferred.

construction. The filling plug 55, however, preferably carries a measuring bar 98 which can be calibrated whereby upon withdrawing the same, the amount of liquid in thereser- Voir can be calculated. If desired the plug 50 can be eliminated and made integral with the head 95 as shown in Fig. 9. As in the preferred construction a conduit 21 connectsmits only a small amount of liquid to pass through the valve 101 when it is opened. The valve 101 is operated by an arm 103 and this arm is connected by a shipper rod 104 .with the usual choke rod 105. Ihe other end of this choke rod connects in the usual manner with the butterfly valve 106 controlling the admission of air to the carburetor 107. These parts are so adjusted that when the choke 105 is pulled out more than half way in starting the truck or bus engine that the valve 101 will open and a small amount of the liquid in the reservoir 90 will pass through the line 100, compensatorfZO and into the intake manifold. By providing this primary charge the unconsumed gasoline which accumu ates in the cylinders during starting and the increased tendency of such gasoline to form carbon deposits and damage due to gasoline washing lubricant from cylinder walls is counteracted. In this construction a spring 108 is provided which immediately closes the cock 101 and holds open the carburetor choke butterfly valve 106 when thechoke rod 105 is released.

As a whole this invention provides a device for feeding a small quantity of liquid in spray form to the intake manlfold of an internal combustion engine which operates under a constant underpressure to feed a constant quantity of liquid regardless of variations in the pressure or velocity of the gases drawn through the intake manifold. It also feeds regularly whether the reservoir is full or not, since an excess of liquid is sprayed by the pump and in its preferred form the device contains no moving parts. All orifices, particularly inlet orifices, are screened or otherwise protected, the device is mounted so that there is no strain on any of the joints, a minimum amount of manifold air is used to do the work, all parts are accessible for cleaning or repairs, all adjustments are fixed, the device is of large capacity, and will function properly without attention on the part of the operator. It can also be marketed at low cost as compared with devices of this general character on the market and can be inexpensively installed.

Other forms of apparatus can be employed embodying the features of our invention instead of the ones here ex lained, change being made in the form 0 construction, provided the elements stated by any of the following claims, or the equivalent of. such stated elements, be employed.

We therefore particularlypoint'out and chamber betweensaid mixing means and said outlet and baflle means interposed between said mixing means and said metering member for diverting excess liquids from said metering member.

2. A device of the character described, comprising a body having a chamber which is provided with a gas inlet and an outlet, means for mixing liquid with the gas passing through said chamber, means connecting said outlet with a source of underpressure, a metering plate extending across said chamber and provided with a hole, said hole permitting only a measured quantity of mixed gas and liquid to escape through said outlet and a bafiie member interposed between said mixing means and said metering plate for divertlng-excess liquids from said metering member.

3. A device of the character described, comprising a body having a chamber which is provided with a gas inlet and an outlet, means for mixing liquid with the gas passing through said chamber, means connecting said outlet with a source of underpressure, a metering plate extending across said chamber and provided with a hole, said hole permitting only a measured quantity of mixed gas and liquid to escape through said outlet and a baflle member interposed between said mixing means and said metering plate, comprising a bafiie plate extending across said chamber and having a hole arranged out of the line between said mixing means and said metering hole.

4. A device of the character described, comprising a body having a chamber which is provided with a gas inlet and an outlet, means for mixing liquid with the gas passing through said chamber, means connecting said outlet with a source of underpressure, a metering plate extending across said chamber and provided with a hole, said hole permitting only a measured quantity of mixed gas and liquid to escape through said outlet and a bafile member interposed between said mixing means and said metering plate, comprising a baffle plate arranged between said metering plate and said mixing means and spaced from said metering plateand having a relatively large hole and a guard member secured to said baffle plate and interposed between said mixing means and the hole in said bafiie plate. 1

5. A device of the character described, comprising a body having a chamber which is provided with a gas inlet and an outlet, means for mixing liquid with the gas passing through said chamber, means connecting said outlet with a source of underpressure terposed between said member and said outlet and disposed above said inlet.

6. A device of the character described, comprising a body having a chamber which is provided with a gas inlet and an outlet,

means for mixing liquid with the gas passing through said chamber, means connecting said outlet with a source of underpressure, a metering plate extending across said chamber and interposed between said mixing means and said outlet, said metering member being provided with a hole which permits a definite amount of mixed gas and liquid to escape through said outlet, an absorbent pad extending across said chamber between said metering plate and said outlet, said pad being disposed above said inlet and being spaced 0. short distance fromsaid metering plate and a screen arranged between said pad and said outlet.

7. A device of the character described, comprising a cylinder, removable heads arranged at opposite ends of said cylinder, a inlet at one of said heads and an outlet at the other head, means connecting said outlet with a source of under-pressure, means adjacent the inlet head for mixing liquid with the gas passing through said cylinder, a metering plate interposed between the end of said cylinder and said outlet head and having a hole which permits a measured quantity of mixed gas and liquid to escape through said outlet, a baffle plate interposed between said outlet head and the end of said cylinder and having a relatively large hole extending therethrough, said baffle being dished at its center to provide a space between said metering plate and said baffle plate, a guard secured. to said bafiie plate and extending toward said mixing means and interposed between said mixing means and the hole in said baifie plate,

an absorbent pad interposed between said metering plate and said outlet head, a washer interposed between said pad and said metering plate and a screen interposed between said pad and said outlet head, the gas from i said inlet being forced to pass around said guard, through the holes in said baffle plate, through the metering holes in said metering plate, through said absorbent pad and screen and out through said outlet.

8. A device of the character described, comprising a body forming a liquid reservoir and a chamber above the liquid, a pump arranged in said reservoir, a gas inlet and an. outlet for said chamber, a conduit connecting said outlet with a source of underpressure, and. compensating means associated with said conduit for maintaining a predetermined underpressure in said chamber regardless of variations in said source of underpressure, said under-pressure actuating said pump to discharge said liquid in said chamber, said compensating means and pump being operprising a bod forming a liquid reservoir and a chamber a ove said liquid, an outlet for said chamber, means connecting said outlet with a source of underpressure, a vertical lift tube supported in said reservoir and having a constricted neck directed toward said chamber, a gas conduit arranged in said reservoir, one end of said gas conduit being arranged adjacent said constricted neck and the o her end being open to the atmosphere whereby upon creating an underpressure in said chamber a flow of liquid up said lift tube will be induced by the gas passing through said conduit, and a felt pad arranged above the inlet of said conduit and filtering the gas.

1.0. A device of the character described, comprising'a body forming a liquid reservoir and a chamber above said liquid, an outlet for said chamber, means connecting said outlet with a source of underpressure, a vertical lift tube supported in said reservoir, and having a constricted neck directed toward said chamber, a gas conduit arranged in said reservoir, one end of said gas conduit being arranged adjacent said constricted neck and the other end being open to the atmosphere whereby upon creating an underpressure in said chamber a flow of liquid up said lift tube will be induced by the gas passing through said conduit, and a metal gauze cage carried by the lower end of said lift tube and filtering the liquid drawn into said lift tube, said cage bearing against the bottom of said reservoir.

11. A device of the character described, comprising a body forming a liquid reservoir having an open upper end and an outwardly extending flange at its upper rim, a

head extending over said reservoir, and provided with a gas inlet and an outlet, means connecting said outlet with a source of underpressure, means for mixing liquid with the gas passing through said reservoir and means for securing said head to said reservoir and supporting said reservoir and head, comprising a bracket having a horizontal part provided with an opening adapted to receive the body of said reservoir, a gasket interposed between said bracket and the under side of the flange of said reservoir, a plural ity of bolts arranged to draw said bracket and head together and a flange formed integrally with said horizontal part and being adapted for attachment to a vertical surface.

12. A device of the character described comprising a chamber having a gas inlet and an outlet, the gas inlet being disposed adja-' in said limiting means comprises a plate having an opening formed therein through which the mixture of gas and liquid must pass and a baflle member interposed between said mixing means and the opening of said limiting means.

In testimony whereof we hereby aifix our signatures.

WILLIAM M. S. JACKSON. PAUL F. HAOKETHAL. 

